**Complex number** is usually denoted by** Z=**** (x, y)** or **z= x+ι y,** complex number is the** large number** which is a group of all number. **Natural number** N, **whole number** W, **set of integer** Z, **set of rational numbe**r Q,** set of irrational number** Q’, **set of real** **number** R. Complex number has **two part** (i) real part (ii) imaginary part. When we complex number, multiply two parts each other.

**Two complex number multiply**

**z1= x1+ ι y1**

** z2 = x2+ι y2**

we simply multiply complex** z1×z2 **number each other

applying iota square = -1 then

**y****1****y****2 ****become – ****y****1****y****2**** ** (iota square application)

rearranging the real and imaginary part of multiplication

This is multiplication of two complex number.

**Example of complex number multiplication**

IF we have two complex number

** Z1= 2+6i and **

**Z2 = 1+4i**

**Z1×Z 2 = (2+6i)(1+4i)**

**= 2+8i+6i-24**

**= -22+14i**

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